CN100410726C - Optical scanning apparatus - Google Patents
Optical scanning apparatus Download PDFInfo
- Publication number
- CN100410726C CN100410726C CNB2006101518174A CN200610151817A CN100410726C CN 100410726 C CN100410726 C CN 100410726C CN B2006101518174 A CNB2006101518174 A CN B2006101518174A CN 200610151817 A CN200610151817 A CN 200610151817A CN 100410726 C CN100410726 C CN 100410726C
- Authority
- CN
- China
- Prior art keywords
- peristome
- rotary optical
- polygon mirror
- polyhedral
- polyhedron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims description 37
- 230000014509 gene expression Effects 0.000 description 19
- 238000003384 imaging method Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 238000010023 transfer printing Methods 0.000 description 8
- 239000000758 substrate Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000035611 feeding Effects 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
- G02B26/121—Mechanical drive devices for polygonal mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
- G03G15/0435—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure by introducing an optical element in the optical path, e.g. a filter
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/04—Arrangements for exposing and producing an image
- G03G2215/0402—Exposure devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
- Laser Beam Printer (AREA)
Abstract
At least one exemplary embodiment is directed to a first airflow guide device covering an upper portion of a polygon mirror and having respective opening portions in an upper surface and a lower surface. The lower surface opening portion can have an annular wall opened in the direction all around the perimeter of the polygon mirror, facilitating an airflow path capable of circulating an airflow between the upper surface opening portion and the lower surface opening portion. Thus, airflow generated in a vertical direction in association with the rotation of the polygon motor, is guided, and variations in pressure applied to the polygon motor are reduced, thus facilitating an increase in the rotation accuracy of the polygon motor.
Description
Technical field
The present invention relates to light scanning apparatus.
Background technology
In the past, in the imaging device that adopts electrophotography, make laser beam deflection scanning (for example, utilizing the polygon mirror of high speed rotating), and shine on the photoreceptor.That is,, form latent image utilizing charger to make on the photoreceptor of surperficial uniform charged by rayed according to picture information.Then, utilize developer with resulting developable latent image, will be to recording materials by the image conversion that develops, thus form image.
Polygon mirror in the above-mentioned imaging device is installed on the turning axle of brushless motor coaxially, so that constitute the polyhedron motor, and, described polygon mirror is arranged in the light-beam scanner of imaging device, so that be driven with 20,000rpm to 50, the high speed rotating of 000rpm.
But,, produce air-flow and cause the problem of noise when this polyhedron motor during with high speed rotating.In order to overcome this problem, the past, the hermetic seal of polyhedron motor is got up, reduce sound to the outside leakage of device.For example, as described in, the polyhedron motor is arranged in the space of the hermetic seal of separating by cover and housing at the open No.2000-330055 of Japanese patent unexamined.
Even when with the hermetic seal of this space, the wind gap noise of polygon mirror also can take place.In Jap.P. No.3472142, the structure that reduces this wind gap noise has been described.Shown in the skeleton diagram among Figure 10 A-B, polyhedron motor 11-7 is by hermetic seal, in the lid member that is provided with the cylindrical part 104 that covers described polygon mirror periphery, narrow annular channel 40 is set, this narrow annular channel is offered around the whole periphery of polygon mirror 11-10, and extends along the outside direction of polygon mirror.In this manner, make in described lid to become in a circumferential direction evenly, and reduce noise effectively along the air-flow of the direction of the surfaces of revolution.
But,,,, can not make air pressure even owing to go up the reason of the air-flow that produces in the rotation direction (hereinafter referred to as vertical direction) of polyhedron motor even when being provided with when covering according to document recited above.
Because the polygon mirror rotation, because the viscosity of air produces along the outside airflow flowing of the radial direction of polygon mirror on the ground, upper surface part top of polygon mirror, the upper surface of polygon mirror becomes negative pressure.Similarly, for the rotor of motor,, produce air-flow, thereby produce pressure gradient along vertical direction according to its shape.Generally, these air-flows are synthesized, along the big air-flow of rotation direction generation of polyhedron motor.Particularly, if the upper surface part of polygon mirror or lower surface portion produce negative relative pressure (for middle surface of revolution) and produce pressure gradient, the variation that then is applied to the pressure on the deflector surface of non-circular polygon mirror of rotation becomes on sense of rotation greatly, and the problem that worsens takes place the rotation variation that can cause the polygon mirror that is under the high precision Spin Control.If the rotation variation of polygon mirror takes place, then the sweep length on photosensitive drums can change, and, cause the ropy image that particularly in the image of scanning end of a period side, produces distortion, perhaps, by the image of multiple color is got up to produce in the panchromatic printer of image, can cause ropy image, for example, color dislocation.
In recent years, the semiconductor laser that has a plurality of luminous points by employing is as light source and reduce the number of reflecting surface, has reduced the diameter of polygon mirror.Thereby, on the basis that moment of inertia reduces, can reduce the driving polygon mirror and rotate needed electric power, can shorten the starting time, and can make the light-beam scanner miniaturization.On the other hand, owing to moment of inertia is reduced by the diameter that reduces polygon mirror, so rotation variation recited above tends to become remarkable especially.
Figure 11 is the cut-open view of polyhedron motor, and as described in Jap.P. No.3472142, this polygon mirror is arranged in the space of the hermetic seal that quilt cover member and housing separate.Be illustrated in the result of the flow analysis of the air-flow that produces in the process of polyhedron motor 11-2 rotation around the arrow (F11, F12) of polyhedron motor.Particularly, in the structure of circumscribed circle diameter less than the diameter of motor rotor of polygon mirror 11-1, as shown in figure 11, air flows downward on whole polygon mirror shown in figure arrow F12.Particularly, on the upper surface part of polygon mirror, produce the vortex flow of representing by arrow F11, and the inflow of air is restricted, thereby, produce negative pressure and be regardless of 150, by the air-flow performance synergy that arrow F12 represents, in the vertical direction produces significant pressure gradient.Thereby, become more remarkable along the pressure gradient of vertical direction, and the negative pressure that produces at the upper surface place of polygon mirror can surpass 100Pa.
Thereby, be desirably on the polyhedral rotation direction of rotary optical, the pressure gradient on the vertical direction is minimized.
Summary of the invention
At least one exemplary embodiment relates to the light scanning apparatus that can be used in the image processing facility (for example, known other image processing facility of laser printer, duplicating machine, facsimile recorder, computing machine and those of ordinary skill in the related art).
According at least one exemplary embodiment of the present invention, be reduced in the pressure gradient of the polyhedral rotation direction of rotary optical.Light scanning apparatus according to an aspect of the present invention comprises: the rotary optical polyhedron is used for the deflection laser light beam and scans; Housing member, described rotary optical polyhedron is contained in the described housing member, and described housing member has the polyhedral surface of the described rotary optical of covering on the extension of the polyhedral rotation direction of described rotary optical; And air flue formation member, described air flue forms member and is used to form air flue, and described air flue forms member and is arranged between the described surface and described rotary optical polyhedron of described housing member, and comprises: first peristome; Second peristome, described second peristome are positioned at a side identical with described first peristome on the polyhedral rotation direction of described rotary optical for laser beam enters the polyhedral position of described rotary optical; And wall, described wall is used to form the air flue that is communicated with described first peristome and described second peristome, wherein, described second peristome is positioned on the polyhedral rotation direction of described rotary optical than described first peristome from the farther position of described rotary optical polyhedron, and described first peristome is bigger than the polyhedral circumscribed circle diameter of described rotary optical.
To the description of exemplary embodiment, further feature of the present invention will become apparent by with reference to the accompanying drawings.
Description of drawings
Fig. 1 is the cut-open view of the polyhedron motor part in first exemplary embodiment.
Fig. 2 is the top view of the laser scan unit in first exemplary embodiment.
Fig. 3 is the cut-open view of the laser scan unit in first exemplary embodiment.
Fig. 4 is the curve map of the data in first exemplary embodiment of expression.
Fig. 5 A and 5B are the diagrams of the polyhedron motor part in second exemplary embodiment of expression.
Fig. 6 A and 6B are the diagrams of the polyhedron motor part in the 3rd exemplary embodiment of expression.
Fig. 7 A and 7B are the diagram of expression with respect to macroscopical air-flow of polyhedron motor generation.
Fig. 8 is the diagram of expression with respect to the air-flow of the generation of the polyhedron motor in first exemplary embodiment.
Fig. 9 is the skeleton diagram of imaging device.
Figure 10 A and 10B are the skeleton diagrams of the polyhedron motor part in the known example.
Figure 11 is the diagram of expression with respect to the analysis result of the air-flow of the generation of the polyhedron motor in the known example.
Embodiment
Below the description of at least one exemplary embodiment, only be for illustrative purposes, never be attempt to the present invention with and use or use and limited.
Known technology, technology, device and material for the person of ordinary skill in the relevant may not can go through, still again, in suitable place, can carry out corresponding description, for example, the manufacturing of polygon mirror and the type of sealing material that adopted etc.
In all examples that here illustrate and discuss, any specific numerical value, for example the number of the side of the size in gap, diameter of a circle, polygon mirror all should be interpreted as illustrative rather than restrictive.Thereby the example of other of exemplary embodiment can have different values.
Notice that among the figure below, similarly therefore reference number and the similar project of letter representation, in case in a figure project was carried out detailed description, may not can among the figure afterwards discuss again.
Note,,, also mean the correction and the reduction of noise here when mentioning the timing that is used for noise.
Describe the present invention with reference to exemplary embodiment below.
First embodiment
With reference to example first exemplary embodiment of the present invention is described below.
Fig. 2 and Fig. 3 are the skeleton diagrams according to the laser scan unit of first exemplary embodiment of the present invention.Fig. 2 is a top view, and Fig. 3 is the cut-open view of the unit main body when observing from the front.Fig. 1 is a cut-open view of at length representing the periphery of polyhedron motor.
The laser scan unit 1 of first exemplary embodiment is described with reference to Fig. 2 and Fig. 3 below.
In Fig. 2 and Fig. 3, reference number 19 expression light source cells, it comprises lasing fluorescence diode 19-1, its drive circuit substrate 19-2, collimation lens lens barrel 19-3.Reference number 18 expression cylindrical lenses, reference number 90-4 represents to be arranged on the aperture diaphragm on the scanner shell 90, reference number 11 expressions (for example utilize screw or other retention mechanism and method, breech lock, the bonding and known other retention mechanism of those of ordinary skill and the method and the equivalent of correlative technology field) be fixed to the polyhedron motor on the scanner shell 90.In this structure, comprise as the polyhedral polygon mirror 11-1 of rotary optical, the brushless motor 11-2 and the substrate 11-3 that allow laser deflection and scanning.As shown in Figure 1, polygon mirror 11-1 forms an integral body by the rotor of elastic pressurizing element 11-5 and plate-like fixed component 11-4 and brushless motor 11-2. Reference number 12 and 13 expressions are as the f θ lens of imaging len, and the picture that is used for having predetermined laser spot diameter is formed on photosensitive drums, reference number 17 expression catoptrons.As mentioned above, by optical element 12,13 and 17 is set, in exposure as the enterprising row image of image bearing member of plane of illumination.Reference number 16 expression beam detectors (below be called BD) are so that be provided at the timing that writes laser on the photosensitive drums 2 that plays a part image carrier with behavior base.Reference number 14 expressions are used for the catoptron of described BD, and reference number 15 expressions are used for the imaging len of described BD.
When the rotation variation of polygon mirror takes place, be that the basis provides with the line scanning regularly owing to write, so the scanning of image on main scanning direction begins lateral deviation from less relatively by BD16.But distolateral in the scanning end of a period of main scanning direction, can fluctuate mistakenly along the direction of scanning in the position of image.
Utilize laser scan unit 1 scanning photosensitive drums 2.
The polyhedron motor 11 of first exemplary embodiment comprises that circumscribed circle diameter is that the polygon mirror 11-1 at four sides of 25mm and the external diameter of brushless motor 11-2 are the rotor portion of 30mm.Because the external diameter of above-mentioned rotor portion is greater than the circumscribed circle diameter of polygon mirror, so the whole air-flow that is produced by polygon mirror 11 becomes shown in Fig. 7 A.That is, in the vertical direction, air-flow tends to directed downwards.Thereby in laser scan unit 1, air is with along the air-flow of vertical direction with point to the sense of rotation of polygon mirror and mode that the air-flow outwards dispersed is synthesized in the horizontal direction flows.
In Fig. 1, resin component element 7 is arranged on polygon mirror 11 and goes up the air flue that covers between 91 and forms member.Air flue forms member 7 and comprises disc-shaped main body framework 7-3 and arm 7-6, and this arm 7-6 location also is fixed on the upward cover 91 that plays the housing effect.In this exemplary embodiment, this air flue forms member plays a part to cover the polyhedral part of rotary optical on the polyhedral rotation direction of rotary optical lid member.According to this structure, can make the pressure gradient stabilization of the polyhedral marginal portion of rotary optical that is capped.Even when the lid that covers the polyhedral described part of rotary optical is not set, problem can not take place yet.In the bottom of this main body frame 7-3, be provided with around the annular wall 7-4 (first peristome) on the top of polyhedron motor 11, its inside edge can be provided with the taper of dispersing downwards.Center section can be provided with the taper 7-5 of the profile of following the polyhedron motor.The circular port 7-2 (second peristome) that has inside diameter D in the topmost setting, circular port 7-2 and on along the whole circumference direction gap 7-7 is set between the cover 91.This circular port 7-2 is arranged on the surface on the polygon mirror on the rotation direction of polygon mirror.Owing to be provided with the tapered portion of dispersing downwards, so can reduce the turbulent flow that produces owing to air-flow along vertical direction.
And then, housing member 90 and 91 are set, so that make the space that comprises the polyhedron motor be in the state of hermetic seal in fact.Thereby, by being set, air flue forms member in housing, can reduce the dirt and the noise of polygon mirror.
Shown in the skeleton diagram of Fig. 8, because member 7 former thereby comprise the air-flow F2 that flows downward and to member 7 airflow flowing F1 round the air-flow that the polyhedron motor produces.As a result, have only a small negative pressure to be applied on the upper surface portion 151 of polygon mirror 11-1, and, diminish with respect to the pressure on polygon mirror surface (upper surface in the rotation direction).Thereby, can obtain the high-precision rotation of polygon mirror.In this exemplary embodiment, air-flow F1 and F2 are by member 7 circulations.And then, the such effect of taper performance of taper 7-5 and annular wall, that is, between member 7 and polyhedron motor, more mobile along the air-flow of vertical direction.
Form the opening diameter D of the upper circular peristome 7-2 of member 7 with respect to above-mentioned air flue, by forming the pressure gradient that this hole reduces the polygon mirror upper surface part simply, thereby, improve the rotation variation of polyhedron motor.As shown in Figure 4, by increasing opening diameter D, can improve the rotation variation of polyhedron motor.When the ratio of specifying opening diameter D with respect to the circumscribed circle diameter of polygon mirror is 20% or when bigger, the rotation variation becomes 0.004% or littler, the possibility of obvious color dislocation reduces.That is, can make air-flow even in a circumferential direction, and can improve the negative pressure that the part place on polygon mirror produces satisfactorily.This relation also extensively is suitable for for the size and the rotational speed of polygon mirror.But, if aforementioned proportion surpasses 100%, then following problem can take place.Weakened for guide effect from the air-flow of the upper surface part directed outwards of polygon mirror.Thereby the opening diameter of upper circular peristome 7-2 is 20% to 100% to be effective with respect to the ratio of polygon mirror circumscribed circle diameter.
The rotation variation of polyhedron motor is by determining the P-P value of the variable quantity of rotational speed divided by rotational speed.The P-P value is meant the poor of maximum rotative speed and minimum rotational speed.In measurement, be that the basis is input in the time-interval counter with the BD output signal of light beam scanning unit with the number of the reflecting surface of polygon mirror, determine the rotation variation by the sigtnal interval.For the visual benchmark relevant with the rotation variation, the rotation variation of polygon mirror be 0.004% or littler situation under, from being in outside the image region and providing BD16 regularly to become 15 μ m or littler to the scanning distolateral offset on the direction of scanning that ends.And then, can from by 40% or the zone represented of bigger opening select a zone, in this zone, reach the variation that does not observe in lower limit and the relation between opening diameter and rotation variation basically.When opening is 40% or when bigger, can be with from being positioned at outside the image region and providing BD16 regularly to be controlled at less value to the scanning distolateral offset on the direction of scanning that ends.As a result, because the color dislocation can not become obviously in image, so, in the laser scan unit of vertical width that can scan almost whole A4 size, can obtain similar relation.
Distance between annular wall 7-3 and the light beam L1 can be in outside the scope of blocking light beam usually, and under the situation of not blocking light beam L1, this distance is more little, and annular wall is useful more during steering current in vertical direction.
In this exemplary embodiment, the circular port 7-2 in the 7-7 of gap and on the clearance delta L of cover between 91
3Be 3mm.But, only otherwise barrier air, 1mm or littler clearance delta L
3Just can play a role satisfactorily.
Clearance delta L between air flue formation member and polygon mirror
1With Δ L
2In the time of in 2 to 6mm scope, reduce turbulent generation, and reduced noise.
In this exemplary embodiment, its structure comprises circular open portion and circular wall.But, can replace circular shape and comprise polygonal shape.
So far, laser scan unit according to first exemplary embodiment has been described.Fig. 9 illustrates the application of laser scan unit in the panchromatic duplicating machine of numeral of first exemplary embodiment.The copying operation of digital panchromatic duplicating machine is described below with reference to Fig. 9.In the accompanying drawings, reference number 80 expression manuscript reading section, reference number 10 expression full color imaging portions.Four imaging station of configuration in full color imaging portion 10, each imaging station has their the photosensitive drums 2a as the image bearing member, 2b, 2c and 2d separately.
Around photosensitive drums and laser scan unit 1a, 1b, 1c and 1d, dispose charging mechanism 3a, 3b, 3c and the 3d of their special uses.Configuration developing apparatus 5a, 5b, 5c and 5d are so that develop to formed electrostatic latent image.Bulging cleaning plant 4a, 4b, 4c and 4d are set, so that remain in the toner on the photosensitive drums after the removal transfer printing.Each transfer device 6a, 6b, 6c and 6d are set, so that the toner on the photosensitive drums is looked like to be transferred on intermediate transfer material or the recording materials.Reference number 51a to 51d represents the developer container one to one with developing apparatus 5a, 5b, 5c and 5d, and described container is configured in the tight below of horizontal part of laser scan unit 1a, 1b, 1c and 1d and the next door of vertical component effect.By mounting and dismounting cylindrical developer box developer is replenished.Here, imaging station Pa, Pb, Pc and Pd are the places that forms cyan image, pinkish red image, yellow image and black image respectively.
On the other hand, under photosensitive drums 2a, 2b, 2c and 2d, dispose endless belt-shaped intermediate transfer belt 61 in mode by each imaging station Pa to Pd.Intermediate transfer belt 61 is wound on driven roller 62 and driven voller 63 and 65, and is provided with cleaning plant 64, is used to clear up the surface of described band.
In said structure, expose by charging mechanism 3a and the laser scan unit 1a that utilizes the first imaging station Pa, on photosensitive drums 2a, form electrostatic latent image.Utilize developing apparatus 5a, convert electrostatic latent image to visual image by the developer that contains cyan toner, and utilize transfer device 6a that this cyan toner is looked like to be transferred on the surface of intermediate transfer belt 61 as the cyan toner picture.
On the other hand, similarly, when above-mentioned cyan toner looks like to be transferred on the surface of intermediate transfer belt 61, form pinkish red toner picture at the second imaging station Pb place.Then, utilize transfer device 6b, with pinkish red toner picture accurately on the intermediate transfer belt 61 of transfer printing and the transfer printing of having finished the above-mentioned first imaging station Pa of being added to.
Subsequently, carry out the imaging of yellow image and black image, the toner of four looks is looked like to be added on the intermediate transfer belt 61 to be similar to mode recited above.Utilize secondary transfer roller 66, with the toner of four looks on the intermediate transfer belt as transfer printing (secondary transfer printing) to recording materials S, described recording materials by feed roll 71, feed rolls to 72 and register roller to 73 feedings to carton 70 when providing regularly.After the secondary transfer printing of recording materials S is finished, utilize fixing roller to 74 heating of toner picture and photographic fixing, thereby on recording materials S, produce full-colour image transfer printing.
After transfer printing was finished, the toner that utilizes cleaning plant 4a to 4d will remain on each photosensitive drums 2a to 2d was removed, and made photosensitive drums 2a to 2d prepare for imaging subsequently.
Second exemplary embodiment
Second exemplary embodiment of various details.
Fig. 5 A and 5B are the skeleton diagrams of second exemplary embodiment of expression.Fig. 5 A is a cut-open view, and Fig. 5 B is the top view of polyhedron motor.
Second exemplary embodiment comprises polyhedron motor 110, wherein, circumscribed circle diameter be six the polygon mirror 11-6 of 50mm be installed to the similar brushless motor 11-2 of first exemplary embodiment on.The circle tube member 9 that plays the effect of air flue formation member has top and bottom circular open, and this circle tube member 9 is configured on the substrate 113 of polyhedron motor.The polygon mirror side of this circle tube member, be that upper surface side on the rotation direction is (first peristome) that opens wide.A plurality of peristomes (second peristome) are configured in the low side of ratio polygon mirror on the rotation direction.Owing to will cover on the substrate 113 that member is installed to the polyhedron motor, so the opening in the lower surface on the rotation direction is blocked.In this exemplary embodiment, this circle tube member plays a part the cover member, covers the polyhedral part of rotary optical on the polyhedral rotation direction of rotary optical.According to this structure, make the pressure gradient stabilization of the polyhedral edge part of rotary optical that is capped.Even the lid that covers the polyhedral described part of rotary optical is not set, problem can take place yet.Described a plurality of peristome will be described below.A plurality of ribs are set on substrate 113, and described a plurality of ribs play a part the supporting member of the described lid of supporting, and described peristome is formed between each rib.In this exemplary embodiment, dispose a plurality of ribs, in addition, also dispose a plurality of opening 9-3.
When the motor-side configuration of driven in rotation polygon mirror is covered, opening is configured on the side of a side lower than the rotation polygon mirror in the rotation direction.
In second exemplary embodiment, because the circumscribed circle diameter of polygon mirror is greater than the external diameter of rotor, so the air-flow of whole polyhedron motor is mobile along direction up from the bottom, shown in Fig. 7 B.
Thereby, can with can have taper, its inside can copy cylindrical wall 9-1 that the profile of polyhedron motor upwards disperses in the mode of the bottom surface that covers polygon mirror around 9 configurations of overall cylindrical member.Also can be at the inboard of lower openings configuration taper 9-2, between substrate 113 and circle tube member 9, the spacing with rule disposes a plurality of hole 9-3 along radial direction in a circumferential direction.A plurality of holes can be set in a circumferential direction, help making the pressure in the lid to become even.According to this structure, can be almost not intrusively with air-flow recited above from the bottom-boot to the top, and, can reduce the generation of the pressure gradient on the vertical direction.
The 3rd exemplary embodiment
With reference to example the 3rd exemplary embodiment of the present invention described below.
Fig. 6 A and 6B are the skeleton diagrams of the 3rd exemplary embodiment of expression.Fig. 6 A is a top view, and Fig. 6 B is a cut-open view.
In the 3rd exemplary embodiment, configuration cover 44, so as with the housing 11-7 of polyhedron motor and housing 190 together, the top hermetic seal of polyhedron motor 111 is got up.The peripheral glass pane 46 that is bonded with around cover 44 outer wall makes light beam L1 see through very close to each otherly, still prevent to cover inside and outside between air exchange.At the outer circumferential side of polygon mirror 11-10, can utilize be arranged on cover 44 and each of housing 11-7 on cylindrical wall form the air guide element that is provided with narrow annular channel 40.Lid 44 with part that upper surface polygon mirror is faced mutually in configuration round vent 8-5.Utilize almost around the ventilation space 8-6 of whole periphery setting the outside of air hole 8-5 and air guide element is coupled together.
When polygon mirror rotates, on the upper surface portion of polygon mirror, produce one from the center along the air-flow of outward direction.Thereby air flows through and is arranged on air-breather 8-5 and the 8-6 that covers on 44, can reduce pressure gradient, wherein, compares with the pressure at the intermediate surface place of polygon mirror, and the upper surface of polygon mirror 11-10 becomes lower negative to pressure.
Other exemplary embodiment
In above-mentioned exemplary embodiment, the full-colour image output unit only has been described.But the present invention is not limited thereto.Two or more exemplary embodiments can be combined.
As mentioned above,, can form the air-flow on the vertical direction wittingly, so that reduce the pressure gradient on the polyhedral rotation direction of rotary optical according at least one exemplary embodiment of the present invention.
Although describe the present invention with reference to exemplary embodiment,, should be appreciated that the present invention is not limited to the typical embodiment that is disclosed.The scope of claim described below provides the brightest, the present invention includes the 26S Proteasome Structure and Function of all remodeling, equivalence.
Claims (6)
1. light scanning apparatus comprises:
The rotary optical polyhedron is used for the deflection laser light beam;
Housing member, described rotary optical polyhedron is contained in the described housing member, and described housing member has the polyhedral surface of the described rotary optical of covering on the extension of the polyhedral rotation direction of described rotary optical; And
Air flue forms member, and described air flue forms member and is used to form air flue, and described air flue forms member and is arranged between the described surface and described rotary optical polyhedron of described housing member, and comprises: first peristome; Second peristome, described second peristome are positioned at a side identical with described first peristome on the polyhedral rotation direction of described rotary optical for laser beam enters the polyhedral position of described rotary optical; And wall, described wall is used to form the air flue that is communicated with described first peristome and described second peristome,
Wherein, described second peristome is positioned on the polyhedral rotation direction of described rotary optical than described first peristome from the farther position of described rotary optical polyhedron, and described first peristome is bigger than the polyhedral circumscribed circle diameter of described rotary optical.
2. light scanning apparatus as claimed in claim 1 is characterized in that, described air flue forms member and covers described rotary optical polyhedron at least a portion on described rotation direction.
3. light scanning apparatus as claimed in claim 1 is characterized in that, described second peristome be shaped as circle, and circular opening diameter is in 20% to 100% the scope of the polyhedral circumscribed circle diameter of rotary optical.
4. light scanning apparatus as claimed in claim 1 is characterized in that, described first peristome be shaped as circle.
5. light scanning apparatus as claimed in claim 1 is characterized in that, the inside surface of described wall is included in the rake of dispersing to described first peristome from described second peristome on the described rotation direction.
6. light scanning apparatus as claimed in claim 1, wherein, the annular that is shaped as of the inside surface of described wall and the xsect polyhedral rotation direction of described rotary optical quadrature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005265528A JP4769526B2 (en) | 2005-09-13 | 2005-09-13 | Optical beam scanning device |
| JP2005265528 | 2005-09-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1932578A CN1932578A (en) | 2007-03-21 |
| CN100410726C true CN100410726C (en) | 2008-08-13 |
Family
ID=37854775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101518174A Expired - Fee Related CN100410726C (en) | 2005-09-13 | 2006-09-13 | Optical scanning apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8199391B2 (en) |
| JP (1) | JP4769526B2 (en) |
| CN (1) | CN100410726C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4594017B2 (en) * | 2004-09-22 | 2010-12-08 | キヤノン株式会社 | Scanning optical device |
| US7755655B2 (en) * | 2006-05-12 | 2010-07-13 | Kyocera Mita Corporation | Exposure device and image forming apparatus |
| JP5128843B2 (en) * | 2006-05-12 | 2013-01-23 | 京セラドキュメントソリューションズ株式会社 | Optical scanning apparatus and image forming apparatus |
| JP4506860B2 (en) * | 2008-03-14 | 2010-07-21 | 富士ゼロックス株式会社 | Optical scanning apparatus and image forming apparatus |
| JP5332669B2 (en) * | 2008-09-03 | 2013-11-06 | 株式会社リコー | Optical scanning device and image forming apparatus |
| JP5049359B2 (en) * | 2010-01-28 | 2012-10-17 | 京セラドキュメントソリューションズ株式会社 | Optical scanning device and image forming apparatus having the same |
| JP5637494B2 (en) * | 2010-08-20 | 2014-12-10 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP6299083B2 (en) * | 2013-05-28 | 2018-03-28 | 株式会社リコー | Optical writing apparatus and image forming apparatus |
| JP5850892B2 (en) * | 2013-08-30 | 2016-02-03 | 京セラドキュメントソリューションズ株式会社 | Optical scanning apparatus and image forming apparatus |
| JP6017500B2 (en) * | 2014-06-30 | 2016-11-02 | シナノケンシ株式会社 | Optical scanning device |
| KR20160028804A (en) * | 2014-09-04 | 2016-03-14 | 삼성전자주식회사 | Light scanning unit and image forming apparatus employing the same |
| CN107003631A (en) * | 2015-01-22 | 2017-08-01 | 惠普印迪格公司 | Imaging and print system |
| WO2018003317A1 (en) * | 2016-06-27 | 2018-01-04 | 京セラドキュメントソリューションズ株式会社 | Light scanning device and image forming device including same |
| JP6882002B2 (en) * | 2017-02-15 | 2021-06-02 | キヤノン株式会社 | Optical scanning device housing and optical scanning device |
| JP7447653B2 (en) | 2020-04-13 | 2024-03-12 | コニカミノルタ株式会社 | Optical deflector, optical writing device and image forming device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01196018A (en) * | 1988-02-01 | 1989-08-07 | Fuji Photo Film Co Ltd | Light beam scanning device |
| JPH11202241A (en) * | 1998-01-09 | 1999-07-30 | Asahi Optical Co Ltd | Cover for polygon mirror and sealing method for polygon mirror using the same |
| JPH11264949A (en) * | 1998-03-16 | 1999-09-28 | Canon Inc | Optical deflector |
| JP2000330055A (en) * | 1999-05-20 | 2000-11-30 | Sharp Corp | Optical scanning recorder and image forming device |
| JP3472142B2 (en) * | 1997-06-18 | 2003-12-02 | キヤノン株式会社 | Optical deflection scanner |
| CN1881005A (en) * | 2005-06-16 | 2006-12-20 | 三星电子株式会社 | Laser scanning device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5948728A (en) * | 1982-09-13 | 1984-03-21 | Sharp Corp | Light beam scanner |
| JPH01233413A (en) * | 1988-03-15 | 1989-09-19 | Fuji Photo Film Co Ltd | Light beam scanning device |
| JPH0651228A (en) * | 1992-08-04 | 1994-02-25 | Ricoh Co Ltd | Beam deflector |
| JPH0833266A (en) * | 1994-07-15 | 1996-02-02 | Toshiba Corp | Dynamic pressure bearing motor and scanner motor for driving polygon mirror |
| JPH0980347A (en) * | 1995-09-12 | 1997-03-28 | Canon Inc | Optical deflecting device |
| JP3400632B2 (en) * | 1995-12-08 | 2003-04-28 | セイコーインスツルメンツ株式会社 | Spindle motor |
| DE19703596C2 (en) * | 1996-01-31 | 2000-12-14 | Asahi Optical Co Ltd | Scanner and polygon mirror cover |
| US6172786B1 (en) * | 1997-09-03 | 2001-01-09 | Konica Corporation | Optical deflection device and image forming apparatus therewith |
| JP4170736B2 (en) * | 2001-12-21 | 2008-10-22 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| US7436565B2 (en) * | 2005-06-16 | 2008-10-14 | Samsung Electronics Co., Ltd. | Laser scanning device |
-
2005
- 2005-09-13 JP JP2005265528A patent/JP4769526B2/en not_active Expired - Fee Related
-
2006
- 2006-08-22 US US11/466,179 patent/US8199391B2/en not_active Expired - Fee Related
- 2006-09-13 CN CNB2006101518174A patent/CN100410726C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01196018A (en) * | 1988-02-01 | 1989-08-07 | Fuji Photo Film Co Ltd | Light beam scanning device |
| JP3472142B2 (en) * | 1997-06-18 | 2003-12-02 | キヤノン株式会社 | Optical deflection scanner |
| JPH11202241A (en) * | 1998-01-09 | 1999-07-30 | Asahi Optical Co Ltd | Cover for polygon mirror and sealing method for polygon mirror using the same |
| JPH11264949A (en) * | 1998-03-16 | 1999-09-28 | Canon Inc | Optical deflector |
| JP2000330055A (en) * | 1999-05-20 | 2000-11-30 | Sharp Corp | Optical scanning recorder and image forming device |
| CN1881005A (en) * | 2005-06-16 | 2006-12-20 | 三星电子株式会社 | Laser scanning device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20070058235A1 (en) | 2007-03-15 |
| US8199391B2 (en) | 2012-06-12 |
| JP4769526B2 (en) | 2011-09-07 |
| CN1932578A (en) | 2007-03-21 |
| JP2007078999A (en) | 2007-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100410726C (en) | Optical scanning apparatus | |
| JP5013652B2 (en) | Scanning optical device | |
| US7436425B2 (en) | Optical writing apparatus and image forming apparatus | |
| US7760228B2 (en) | Light scanning apparatus and image forming apparatus | |
| US7755655B2 (en) | Exposure device and image forming apparatus | |
| JP5223199B2 (en) | Optical scanning apparatus and image forming apparatus | |
| CN111240008A (en) | Optical deflecting device, optical scanning device having the same, and image forming apparatus having the same | |
| EP0889353B1 (en) | Optical deflecting-scanning apparatus | |
| JP4920988B2 (en) | Measuring apparatus and image forming apparatus | |
| KR20110070202A (en) | Toner cartridge and image forming apparatus using the same | |
| KR101493367B1 (en) | Laser Scanning Unit And Image Forming Apparatus Having The Same | |
| JP6971626B2 (en) | Optical deflector, optical scanning device, and image forming device | |
| JP2003098455A (en) | Optical scanner and image forming apparatus | |
| JP2011186495A (en) | Scanning type optical device | |
| JP2005083997A (en) | Optical sensor and image forming apparatus | |
| JPH11183832A (en) | Scanning optical device and image forming device | |
| JP5414430B2 (en) | Image forming apparatus | |
| JPH11125786A (en) | Scanning optical device | |
| JP2018036515A (en) | Optical deflector, optical scanner, and image forming apparatus | |
| JP2002258201A (en) | Light deflecting scanner | |
| JPH0764010A (en) | Light deflector | |
| JPH11249059A (en) | Optical deflecting device | |
| JPH10221631A (en) | Optical deflection scanner | |
| JPH11258539A (en) | Deflection scanning device | |
| JPH1123995A (en) | Deflection scanner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080813 Termination date: 20180913 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |